Rhinitis can induce asthma because it is a currently accepted view that rhinitis belongs to the upper respiratory tract and asthma belongs to the lower respiratory tract, and that the upper and lower airways belong to the same airway. Rhinitis induces asthma for the following reasons: i. It is related to the nasal bronchial reflex. When the patient’s nasal mucosa is subjected to allergens that induce rhinitis, the patient’s airway will also show increased reactivity, which is the principle of the nasal bronchial reflex. Second, once the rhinitis attack leads to nasal congestion in patients, a large amount of air can only be inhaled through the mouth, after inhalation into the airway is also prone to induce patients to appear airway hyperreactivity, thus triggering asthma. Patients with rhinitis often have postnasal drip syndrome, and nasal secretions often enter the trachea, leading to airway hyperreactivity, which can also easily induce asthma. Fourth, in patients with rhinitis, the eosinophils, mast cells, and other inflammatory mediators involved in the pathogenesis process are also important components involved in asthma. Therefore, their pathogenesis is similar, so rhinitis can induce asthma.